/*
 * Copyright (c) 2004-2022, University of Oslo
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * 3. Neither the name of the copyright holder nor the names of its contributors 
 * may be used to endorse or promote products derived from this software without
 * specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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 */
package org.hisp.dhis.webapi.security.utils;

import com.nimbusds.jose.jwk.Curve;
import com.nimbusds.jose.jwk.ECKey;
import com.nimbusds.jose.jwk.OctetSequenceKey;
import com.nimbusds.jose.jwk.RSAKey;
import java.security.KeyPair;
import java.security.interfaces.ECPrivateKey;
import java.security.interfaces.ECPublicKey;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.util.UUID;
import javax.crypto.SecretKey;

/**
 * @author Morten Svanæs <msvanaes@dhis2.org>
 */
public final class Jwks {
  private Jwks() {}

  public static RSAKey generateRsa() {
    KeyPair keyPair = KeyGeneratorUtils.generateRsaKey();
    RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
    RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
    return new RSAKey.Builder(publicKey)
        .privateKey(privateKey)
        .keyID(UUID.randomUUID().toString())
        .build();
  }

  public static ECKey generateEc() {
    KeyPair keyPair = KeyGeneratorUtils.generateEcKey();
    ECPublicKey publicKey = (ECPublicKey) keyPair.getPublic();
    ECPrivateKey privateKey = (ECPrivateKey) keyPair.getPrivate();
    Curve curve = Curve.forECParameterSpec(publicKey.getParams());
    return new ECKey.Builder(curve, publicKey)
        .privateKey(privateKey)
        .keyID(UUID.randomUUID().toString())
        .build();
  }

  public static OctetSequenceKey generateSecret() {
    SecretKey secretKey = KeyGeneratorUtils.generateSecretKey();
    return new OctetSequenceKey.Builder(secretKey).keyID(UUID.randomUUID().toString()).build();
  }
}
